Comparison Table for Pascal and JavaScript

//Comment after code
{Comment spanning
lines}

//Comment after code
/* Comment spanning
lines */

'Hello World'

"Hello World" or 'Hello World'

begin
  lines of code
end;

{
  lines of code
}

var VAT_RATE = 0.175;

(const VAT_RATE = 0.175 is not universally accepted according to stackoverflow).

var
  forename, surname: string;
  paysTax: Boolean;
  totalHits: integer;
   averageScore: double;
             //same as real
  initial: char;
        //same as ansiChar  
  months: array [1..12] of string;
  rainfall: array [2004..2010, 1..12] of integer;
  ageRecords: array[1..1000] of TRec;

Also  wideChar,  byte,  single, currency,  TDateTime ...

var forename, Surname, paysTax, totalHits,
  averageScore, initial;







var months: [];
  
var rainfall: [[]];
var ageRecords: [];

Also Date ...

surname := 'Morrison';
averageScore := 24.56;
paysTax := True;
initial := 'N';
dateSubmitted := StrToDateTime(
                  '19/4/2014');
months[1] := 'January';
rainfall[2000, 1] := 15;
or  
rainfall[2000][1] := 15;

surname = "Morrison";
averageScore = 24.56;
paysTax = true; //lower case t
initial = 'N';  

dateSubmitted = new Date(2014, 4, 19);

months[0] = "January";
rainfall[0][1] = 15;

If statement
  One statement executed if true



  More than one statement executed if true

if (currentNum > max) then
  max := currentNum
else
  writeln('max still ', max);


if (currentNum > max) then
  begin
    max := currentNum;
    writeln('max increased');
  end
else
  write('max still ', max);

if (currentNum > max)
  max = currentNum
else
  console.log("max still " +
              max.toString());

if (currentNum > max) {
  max = currentNum;
  console.log("max increased");
}
else
  console.log("max still " +
                    max.toString());

case iChoice of
  1 : DoThis;
  2 : DoThat;
end;

switch(iChoice) {
  case 1: DoThis();
          break;
  case 2: DoThat();
          break;
}

for i := 1 to 10 do
  begin
    lines of code
  end;
  
for i := 10 downto 1 do
  begin
    lines of code
  end;

for (var i = 1; i <= 10; i++) {
   lines of code
}


for (var i = 10; i >= 1; i--) {
   lines of code
}

while amount > 0 do
  begin
    lines of code
  end;

while (amount > 0) {
  lines of code
}

repeat
  lines of code
until finished = true;

do {
  lines of code
}
while (!finished)

type
  TAgeRec = record
    surname : string;
    age : integer;
  end;

var ageRecord = {surname: "Cox", age: 17};

Arithmetical operators

+
-
*
/
DIV
MOD

+
-
*
/ (with a real operand)
/ (with integer operands)
%

=


<>
<
>
<=
>=

==
Same value and type: ===

!=
<
>
<=
>=

and
or
not

&&
||
!

procedure ListRecords;
begin
  lines of code
end;

To call the procedure:
ListRecords;

function listRecords() {
  lines of code
};

To call the routine:
listRecords();

procedure ListRec(recNo: Integer);
begin
  lines of code
end;

To call the procedure for the fifth record:
ListRec(5);

function listRec(recNo)
{
  lines of code
}                  
                  
To call the function for the fifth record:
listRec(5);

procedure Calc(var total :
              integer);
begin
  lines of code
end;

var objTotal = {tot: 42};
function calc(total) {  
  total.tot += 1;  
}
calc(objTotal);

function Cube(Num: double): double;
begin
   Cube := Num * Num * Num;
end;

function cube(num) {
   return num * num * num;
}

Inbuilt string functions
  Type conversions
                  
                  
  


  String manipulation

IntToStr converts integer to string
FloatToStr converts real to string
FloatToStrf converts real to formatted string
DateTimeToStr converts from TDateTime to string
StrToInt converts string to integer  
                  

Length returns length of  string



Pos looks for one string within another
and returns the position of the first matching character.

(StrUtils Unit)
MidStr returns the required number of characters
from any position in the string
LeftStr returns the required number of characters
from the front of the string
RightStr returns the required number of characters
from the back of the string
UpperCase  returns a string in upper case
LowerCase returns a string in lower case

toString() converts numeric value to string e.g.
max.toString()


var strNum = "5";
var intNum = Number(strNum);  

var alphabet =
     "abcdefghijklmnopqrstuvwxyz";
var stringLength = alphabet.length;
                  



var jklPos = alphabet.indexOf("jkl");
if (jklPos != -1)
  console.log("jkl position: " +
               jklPos.toString());                


alphabet.substr(9, 3)

alphabet.substr(0, 3)

alphabet.substr(-3)




alphabet.toUpperCase()
forename.toLowerCase()